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    <title>Document</title>
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    <!-- <input type="text" name="" id="input"> -->
    <script>
        // 12 + 14 + 30 + 15 + 14
        // // console.log(Math.ceil(-3.14))
        // var k = 12
        // console.log(k++ + ++k)
        // // console.log(k)
        // var a = 10; 

        // function test(a){
        // a -=3;
        // } 

        // test(a); 
  
        // console.log(a);

        // input.oninput = function(){
        //     console.log(this.value.length)
        // }

        // var reg = /^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w\.-]*)*\/?$/
        
        // console.log(reg.test('https://www.baidu.com/public_s/search-res/index.html'))

        // var reg = /((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)/
        // console.log(reg.test('209.209.209.209'))

        // 12 + 14 + 30 + 15 + 14
        //                         13
        // var i = 15
        // console.log(++i*2)
        
    </script>
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